KEITH E. MULLER, PhD, is Professor and Director of the Division of Biostatistics in the Department of Epidemiology and Health Policy Research in the College of Medicine at the University of Florida in Gainesville, as well as Professor Emeritus of Biostatistics at The University of North Carolina at Chapel Hill where the book was written.

BETHEL A. FETTERMAN, PhD, is Research Associate Professor of Biostatistics at The University of North Carolina at Chapel Hill.